/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.pig.pigpen.editor;

import org.apache.pig.pigpen.LoggerUtil;
import org.apache.pig.pigpen.editor.model.Query;
import org.eclipse.jface.viewers.IStructuredContentProvider;
import org.eclipse.jface.viewers.Viewer;

public class HeaderContentProvider implements IStructuredContentProvider {

    public Object[] getElements(Object inputElement) {
        if (inputElement instanceof Query) {
            return ((Query) inputElement).getHeaderItems().toArray();
        } else {
            LoggerUtil.logError("Internal error: unexpected element type");
            return null;
        }
    }

    public void dispose() {
    }

    public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
    }

}
